Encrypt and decrypt your Personal Data from any location and quickly. The Process is performed on the client side within the browser using javascript. No data is exchanged with the server.

Crypt tool explained
This module is based on a javascript module, which is stored locally (on your computer) by the browser. The module is then ready to do the encryption/decryption for you.

Once you enter some text in the text box and set a password, the locally present javascript module will perform the conversion of the text.

Encryption is performed using MD5 cryptographic signatures on top of an XOR text encryption algorithm to form a practically unbreakable hybrid.

Start the tsxn Crypt tool here

Mobile Devices
With this tool you're able to encrypt and decrypt text messages from any internet-enabled computer around the world just by opening the crypt-page at tsxn.com. A link thin and optimal for mobile devices like pda's, windows mobile phones etc. is provided at

Crypt tool thin link for mobile devices: http://www.tsxn.com/crypt

Local Copy
The crypt tool may be downloaded and stored on a usb-stick or any other storage device, even on your pda and then run from there without the need of internet access.

Crypt tool local copy: crypt.zip

After download, unzip and open crypt.htm with any javascript-enabled browser (Internet Explorer, Firefox, etc.).

The crypt tool is provided by Joseph K. Myers, originally named as Alpha Crypt. For complete reference, the original crypt package is made available here: crypt_orig.zip.

Technical Background

Alpha Crypt uses MD5 cryptographic signatures on top of an XOR text encryption algorithm to form a practically unbreakable hybrid.

Features
Alpha Crypt uses MD5 cryptographic signatures on top of an XOR text encryption algorithm. It is designed for sending messages from anywhere on the Internet, without access to other encryption software. AC will not become confused by text wrapping, missing text, or other mistakes that occur during transmission. By running along a 64-character set, it will not garble binary values, or cause a browser to crash. For this reason, it is especially suited for public free email providers.

Security
Alpha Crypt defeats word-based or probability-based attacks, as well as overcoming methods which measure statistics based on consistent input-output.

Speed
Alpha Crypt is faster than other programs, by reducing cryptology running time primarily to internal bit operations, compatible with JavaScript browsers, instead of auxiliary functions.

Alpha Crypt is offered as-is, without warranty. Although I would feel safe in saying that no one can read a message I send with Alpha Crypt, I do not wish to make any legally binding guarantees, express or implied. You have the freedom to be secure, but freedom is also your own responsibility. I take no liability from any use of this software.

Instructions

If you plan on emailing the contents of an encrypted message, you may wish to include the following note with the encrypted text:

Note: This message was encrypted with Alpha Crypt for safe transmission. Select and copy the message text, and visit http://www.myersdaily.org/joseph/javascript/alphac.html to decrypt the message (a password key is required).

In order to distribute the load from many people using Alpha Crypt, this message is dynamically updated to show the current URL. This way, many websites may post these files and share Alpha Crypt. However, if you wish, you may also use the master url:

http://www.myersdaily.org/joseph/javascript/alphac.html Alpha Crypt by Joseph Myers

Notes

For distribution, a zip file is available, alphacrypt2.zip (5.15 KB: contains alphac.html, timer.js, md5.js, and alphac.js).
Libraries used

Originally from Alpha Crypt by Joseph Myers. MD5 code (md5.js) by Joseph Myers is based on md5.js by Paul Johnston and Greg Holt.

Modified copies of programs in this list are used:

    * alphac.js
    * md5.js
    * timer.js

Joseph K. Myers, 2002/10/10, v.2 2003/11/13, cookies @ users.sourceforge.net.